package com.ruoyi.gateway.service.impl;

import com.google.code.kaptcha.Producer;
import com.ruoyi.common.core.constant.Constants;
import com.ruoyi.common.core.exception.CaptchaException;
import com.ruoyi.common.core.utils.StringUtils;
import com.ruoyi.common.core.utils.sign.Base64;
import com.ruoyi.common.core.utils.uuid.IdUtils;
import com.ruoyi.common.core.web.domain.AjaxResult;
import com.ruoyi.common.redis.service.RedisService;
import com.ruoyi.gateway.config.properties.CaptchaProperties;
import com.ruoyi.gateway.service.ValidateCodeService;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.FastByteArrayOutputStream;

/**
 * 验证码实现处理
 *
 * @author ruoyi
 */
@Service
public class ValidateCodeServiceImpl implements ValidateCodeService {
  @Resource(name = "captchaProducer")
  private Producer captchaProducer;

  @Resource(name = "captchaProducerMath")
  private Producer captchaProducerMath;

  @Autowired private RedisService redisService;

  @Autowired private CaptchaProperties captchaProperties;

  /** 生成验证码 */
  @Override
  public AjaxResult createCaptcha() throws IOException, CaptchaException {
    AjaxResult ajax = AjaxResult.success();
    boolean captchaOnOff = captchaProperties.getEnabled();
    ajax.put("captchaOnOff", captchaOnOff);
    if (!captchaOnOff) {
      return ajax;
    }

    // 保存验证码信息
    String uuid = IdUtils.simpleUUID();
    String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;

    String capStr = null, code = null;
    BufferedImage image = null;

    String captchaType = captchaProperties.getType();
    // 生成验证码
    if ("math".equals(captchaType)) {
      String capText = captchaProducerMath.createText();
      capStr = capText.substring(0, capText.lastIndexOf("@"));
      code = capText.substring(capText.lastIndexOf("@") + 1);
      image = captchaProducerMath.createImage(capStr);
    } else if ("char".equals(captchaType)) {
      capStr = code = captchaProducer.createText();
      image = captchaProducer.createImage(capStr);
    }

    redisService.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
    // 转换流信息写出
    FastByteArrayOutputStream os = new FastByteArrayOutputStream();
    try {
      ImageIO.write(image, "jpg", os);
    } catch (IOException e) {
      return AjaxResult.error(e.getMessage());
    }

    ajax.put("uuid", uuid);
    ajax.put("img", Base64.encode(os.toByteArray()));
    return ajax;
  }

  /** 校验验证码 */
  @Override
  public void checkCaptcha(String code, String uuid) throws CaptchaException {
    if (StringUtils.isEmpty(code)) {
      throw new CaptchaException("验证码不能为空");
    }
    if (StringUtils.isEmpty(uuid)) {
      throw new CaptchaException("验证码已失效");
    }
    String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;
    String captcha = redisService.getCacheObject(verifyKey);
    redisService.deleteObject(verifyKey);

    if (!code.equalsIgnoreCase(captcha)) {
      throw new CaptchaException("验证码错误");
    }
  }
}
